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1. WordNet® 3.0 (2006)
apochromatic
    adj 1: corrected for both chromatic and spherical aberration;
           "an apochromatic lens"

2. The Collaborative International Dictionary of English v.0.48
Apochromatic \Ap`o*chro*mat"ic\, a. [Pref. apo- + chromatic.]
   (Optics)
   Free from chromatic and spherical aberration; -- said esp. of
   a lens in which rays of three or more colors are brought to
   the same focus, the degree of achromatism thus obtained being
   more complete than where two rays only are thus focused, as
   in the ordinary achromatic objective. -- Ap`o*chro"ma*tism,
   n.
   [Webster 1913 Suppl.]

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